Hi FW
The lumps in the photo are gorse bushes I think..although there was a thought in my head that four lumps of granite on the higher ground behind me as I took the photo were part of a stone row...
I decided I was being fanciful but....
I am not well up enough on these things to state if it is or isnt anything, but the ring cairn that I have visited at East Moor has got stone in its construction, http://www.themodernantiquarian.com/post/30115
this one has no sign of stone, just an earth mound.
Also I would of thought a ring cairn would have been in a more prominant position..not on the side of a shallow valley.
I don't know..
Mr H